Will this work with the poe hat available for raspberry pi 4?

Yes it will work. However, you will need to get some pass through pins as the PoE Hat sits ontop of the GPIO of the Raspberry Pi

What battery is used?

There is no battery on this device, however there is a SuperCap which will store the GPS fix data for about 4hours

Is there a RTC battery backup?

Not a traditional RTC., but it does have RTC functionality. Once the GPS gets a fix, the time will be updated and it will be kept accurate via an internal RTC in the GPS module as long as there is power. No GPS fix needed after initial fix. The SuperCap will keep the RTS running for 4 hours if power is remove. Also see look at this http://ozzmaker.com/forums/topic/rtc-on-berry-gps-imu/

ASIN	B072MNBC9M
Amazon Bestseller	#404,874 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #260 in Acceleration Sensors
Batteries Included	No
Batteries Required	No
Battery Average Life	4 Hours
Brand	Ozzmaker
Color Name	Black
Compatible Devices	Raspberry Pi (including Pico)
Connectivity Technology	USB
Date First Available	February 9, 2018
Display Type	LED
Included Components	BerryGPS-IMU Module, Accelerometer, Gyroscope, Magnetometer, Barometer/Altitude Sensor
Item Model Number	BerryGPS-IMUv4
Item model number	BerryGPS-IMUv4
Operating System	Linux
Package Dimensions	8.71 x 5.59 x 1.4 cm; 18 g
Total Usb Ports	2
Wireless Comm Standard	Bluetooth

BerryGPS-IMU GPS and 10DOF for Raspberry Pi - Accelerometer, Gyroscope, Magnetometer, Barometric Pressure / Altitude Sensor

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